Method of welding laminated plates



July 25,1950 H. c. BOARDMAN I mz'mon 0F WELDING LAMINATED PLATES Filed Oct. 6, 1945 Patented July 25, 1950 METHOD OF WELDING LAMINATED PLATES Harry G. Boardman, Chicago, Ill., asslgnor to Chicago Bridge & Iron Company, a corporation of Illinois Application October (i, 1845, Serial No. 620,694

Claims. 1 This invention relates to a method of welding laminated plates, and more particularly to welded tanks in which laminated diaphragms are employed as anchors for opposed tension members, and particularly for opposed diaphragms.

2 What I claim as new, and desire to secure by Letters Patent, is

1. The method of attaching opposed tension members to a laminated plate which comprises 5 fusing the plate in an arcuate zone adjacent the The invention is illustrated in the drawing in areas to be welded and overlapping the same, which: the amount of fused metal extending inwardly Fig. 1 is a plan view partly in section of a sufficiently to bind all of the laminations t0- pressu're vessel to which the invention is applicagether, and then welding the opposed tension ble. members within the pre-fused area.

Fig. 2 is an enlarged view in section of an 2. A welded tank having a laminated plate intersection of a laminated diaphragm and opof at least four plies carrying opposed tension posed tension members. members secured to opposite sides thereof char- The vessel I0, illustrated in Fig. 1, is comprised acterized by a fused arcuate area at the point of of a plurality of intersecting spherical segments, attachment of each tension member, the arcuate the edges of which are joined by diaphragms H, areas intersecting each other at their innermost l2 and I3. It will be noticed that diaphragm I2 portions to bind the plies together. extends from one side of the vessel to the other, 3. A tank as set forth in claim 2 in which the whereas diaphragms H and I3 are joined at diatension members are diaphragms and the fused phragm I2. Diaphragm I2 is illustrated as lamiarcuate areas are zones extending beneath and nated, being made up of sheets I4, I5, l6 and I1. adjacent the diaphragms.

Diaphragms II and I3 are under tension and 4. The method of attaching opposed tension thereafter tend to disrupt the laminae in diamembers to a laminated plate in a storage vesphragm l2. Normally diaphragms H and 13 are sel which comprises fusing the plate in an arcuate joined to the diaphragm l2 by welding, as indizone adjacent the areas to be welded and overcated at 20. lapping the same, the amount of fused metal ex- In accordance with this invention, prior to the tending inwardly sufficiently to bind all of the welding I apply sufficient heat to the opposed laminations together; and then welding the onsid of e p gm I2 to form arcuate portio s posed tension members within the prefused area. 2| and 22 throughout which the metal is com- 39 5. The method as set forth in claim 1 in which pletely fused together. These areas cover the the tension members are diaphragms. portions to which he diaphragms are to be welded and extend beyond the same, the radius of HARRY BIOARDMAN' the arcuate portion being approximately the thickness of the diaphragms II and I I. The 6 REFERENCES CITED fusion is preferably done with the plates in a The following references are of record in the down-fiat position and is not carried to the exme or this patent: tent where the metal of the laminated diaphragm will flow away from the area of application of UNITED STATES PATENTS heat, but is enough to integrate the layers. The Number Name Date sides of the diaphragm may be fused simultane- 9 1 Horton Sept. 3, 1935 ously, or first one and then the other. When the 2333355 Mar. 1941 fusion is completed the arcs intersect at their 2,341,044 Jacksim a1 inner edges. GN PATENT The foregoing detailed description has been FOREI 3 given for clearness of understanding only, and no Number Country Date unnecessary limitations should be understood 411, Gr B n J1me 1934 therefrom. 

